ATBN (Amino-Terminated Liquid Nitrile Rubber) is a butadiene-acrylonitrile copolymer liquid rubber with amino (–NH₂) groups at both ends of the molecular chain.

Structure: Main chain = random copolymer of butadiene and acrylonitrile; chain ends = reactive amino groups. Combines the oil resistance of nitrile rubber with the high reactivity of amino groups.

Appearance: Pale yellow to amber transparent viscous liquid.

Typical Specifications:

• Number-average molecular weight: 3,000–5,000

• Acrylonitrile content: 10%–28%

• Amine value: 1.0 - 2.5mmol/g

• Viscosity (27°C): 100–600 Pa·s

• Glass transition temperature (Tg): –30°C ~ –60°C

Key Features:

• High reactivity: Amino groups react directly with epoxy resins, isocyanates, acid anhydrides (no extra catalyst needed).

• Excellent oil/heat/abrasion resistance: Retains properties of solid nitrile rubber; resistant to mineral oils, fuels, lubricants; good thermal stability.

• Strong adhesion: High interfacial bonding to metals, plastics, composites.

• Low-temperature flexibility: Low Tg; maintains elasticity and impact resistance at low temperatures.

ATBN vs CTBN vs HTBN

1. Epoxy Toughening 

• Function: Reactive toughener for epoxies (alternative to CTBN) can Significantly improves peel strength, impact strength, low-temperature toughness, and humidity resistance; lowers curing temperature.

• Performance: At 20% ATBN loading, epoxy tensile strength ↑ 77%, peel strength ↑ 98%, impact strength = 18.73 kJ/m².

• Uses: Structural adhesives, composite matrices, electronic potting compounds, wind turbine blade adhesives.

2. Polyurethane (PU) Materials

• Reacts with isocyanates (MDI/TDI) to make oil-resistant PU elastomers, seals, rollers, hoses; better oil resistance, abrasion resistance, and low-temperature elasticity than standard PU.

• Used in solvent-free room-temperature-cure adhesives for bonding metals, rubbers, plastics; for automotive/construction equipment sealing & assembly.

3. Oil-Resistant / Anti-Corrosion Seals

• Automotive: Oil seals, O-rings, chassis seals, fuel hose liners; resistant to –40°C to 120°C and fuel/engine oil attack.

• Industrial: Hydraulic seals, chemical gaskets, oilfield packer elements; resistant to acids, alkalis, salt spray, and organic solvents.

4. Electronic / Electrical Potting & Insulation

• Makes insulating potting compounds & sealants for high-voltage components, sensors, power modules; moisture-proof, shock-resistant, weatherable, excellent electrical insulation (volume resistivity ~10¹⁴ Ω·m).

5. Composites & Aerospace

• Impact modifier for aerospace structural parts; insulation/coating layers for solid rocket motors; sealants for missile components; withstands extreme environments, high mechanical performance.

6. Rubber & Plastic Modification

• As a reactive plasticizer for nitrile, neoprene, butyl rubbers; improves processability, enhances interfacial adhesion, suppresses migration.

• Modifies PVC, nylon; replaces DOP/DBP; solves plasticizer migration; improves oil & cold resistance.